Conan Exiles - War Ch 4, harvesting crystal

Now that crystal can only be taken by hand or sorcery, I'm sharing a very quick sorcery how to:
You need: Cursed weapon or armor, a hero heart or stack of cleansing brew. It helps to have the perk Efficient Harvest in expertise (it doubles the take).
I use Hanuman's Grotto, in 2 casts i get 11-13k of crystal.
After clearing the cave corrupt yourself with the cursed piece, cast Mass Cull in the areas of the imp boss and human boss.
Once done, use hero heart or cleansing brew to clear corruption and continue your journey.